170 BULLETIN 57, "UNITED STATES NATIONAL MUSEUM. 



Audital bulla? very small, covering much less than half surface of 

 cochleae. Rami of lower jaw strongly diverging, their spread poste- 

 riorly much greater than the length of each ramus. Ear with con- 

 spicuous inner lappet. No true noseleaf, but entire face and throat 

 a complicated mass of naked dermal outgrowths. Second finger 

 moderately bowed outward, about as long as metacarpal of third. 

 Calcar well developed. No external tail. Interfemoral membrane 

 moderately wide. 



Species examined. — Centurio senex Gray. 



Remarks. — Externally this genus is recognizable by the very short, 

 . broad face, completely covered with wrinkled dermal outgrowths. 

 The skull is distinguished from that of the other short -snouted 

 Stenodermines by the position of the external nares directly over 

 the roots of the incisors. I can see no reason to make Centurio the 

 type of a distinct subfamily. It is very closely related to Sphrnro- 

 nycteris and Ametrida, and in many ways is connected with the 

 typical Stenodermines by such genera as Pygoderma and Phyllops. 

 In spite of the great shortening of the rostrum and consequent dis- 

 torting of the upper canines, the general type of the dentition is not 

 very different from that of Artibeus. 



Genus SPHvERONYCTERIS Peters. 



1882. SpJioTonijcteris Peters, Sitzungsber. k. preuss. Akad. Wissensch., 

 Berlin, p. 988. 



Type-species. — Sphmronyeteris toxophyllum, Peters. 



Geographic distribution. — Tropical South America (Peru and 

 Venezuela). 



Number of forms. — Only the type species is known. 



Characters. — In general like Centurio; face hairy; muzzle with 

 a thickened ridge-like outgrowth, best developed in males; skull 

 with rostrum even more shortened than in the related genus, the 

 nares so retracted between orbits that they are separated from in- 

 cisors by a horizontal area the width of which is nearly equal to 

 distance between canines; anterior edge of orbit produced into a 

 conspicuous, thin plate; palate not twice as wide as long; zygoma 

 noticeably expanded and bent upward at middle; upper incisors 

 very unequal, the inner fully one-third as long as canine, conical, 

 convex in front, concave behind; the outer minute, flat-crowned, 

 closely crowded between first and canine; upper canine not con- 

 cave at base; a minute, quadrate third lower molar. Structure of 

 teeth in general quite as in Centurio, though the molars are less 

 extreme in the development of the Stenodermine peculiarities. 



Species examined.— Sphwronycteris toxophyllum Peters. 



Remarks.— This genus is closely related to Centurio, and it is 

 almost impossible to decide which of the two is the more highly 



